External 5.25" USB-IDE enclosery with IDE swap bay

Rear double on-off (+5V & +12V )switch paypassed with two relays and single line key switch(that original switch on the bay). So what's the point?
How to swap, BEFORE:
*Turn off the rear switch (hard to reach)
*Turn off the bay (only to release the drive)
*Swap the HD
*Turn on the bay and lock the HD
*Turn on the rear switch(only way to make it detect the HD)
NOW:
*Turn off the bay
*Swap the HD
*Turn on the bay(detecting!)

There are also pins for external led on ide-adapter board so I plug bays power led into those pins.